Can send a new text message to a contact but if I reply to their text message I get message can't be sent.

Ever had a problem that baffles you. This one has me baffled. This only happens with one of my contacts.

I can send the person a new text message and it works fine. If the person replies to me, or sends me a new text message and I go to reply to them, the reply fails.

To get around this problem I have to delete all text messages from the person and then I can send them a new message.

It is the weirdest thing I've seen, and so far I've not been able to find a solution to the problem, except my way of working around the problem by deleting text messages from them first.

At this stage the only thing that is strange is the person is using a very old mobile phone. It may be the old mobile phone is somehow issuing a sequence that isn't compatible with my mobile phone.

I thought I'd share this because if others have the same problem, they know if they delete the person's message and send a new text it gets through.

I've not seen this issue with anyone else, just this person.

Kelvin Eldridge
www.OnlineConnections.com.au
IT support.

Update: 19 December 2017
Found there's no need to delete entire text message thread including text message sent to the other person. Only need to delete their text messages received.